{"id":"CVE-2026-33179","summary":"libfuse: NULL Pointer Dereference and Memory Leak in io_uring Queue Initialization","details":"libfuse is the reference implementation of the Linux FUSE. From version 3.18.0 to before version 3.18.2, a NULL pointer dereference and memory leak in fuse_uring_init_queue allows a local user to crash the FUSE daemon or cause resource exhaustion. When numa_alloc_local fails during io_uring queue entry setup, the code proceeds with NULL pointers. When fuse_uring_register_queue fails, NUMA allocations are leaked and the function incorrectly returns success. Only the io_uring transport is affected; the traditional /dev/fuse path is not affected. PoC confirmed with AddressSanitizer/LeakSanitizer. This issue has been patched in version 3.18.2.","aliases":["GHSA-x669-v3mq-r358"],"modified":"2026-05-14T03:52:51.812748868Z","published":"2026-03-20T20:20:09.171Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33179.json","cwe_ids":["CWE-476"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/libfuse/libfuse/releases/tag/fuse-3.18.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33179.json"},{"type":"ADVISORY","url":"https://github.com/libfuse/libfuse/security/advisories/GHSA-x669-v3mq-r358"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33179"},{"type":"FIX","url":"https://github.com/libfuse/libfuse/commit/7beb86c09b6ec5aab14dc25256ed8a5ad18554d7"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libfuse/libfuse","events":[{"introduced":"9157d99f17384f362c65b02cec065e0aec5f0b56"},{"fixed":"033844748010a3b8265bf1c90b9ae8ffe4cd9ca7"}]}],"versions":["fuse-3.18.1","fuse-3.18.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-33179.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}